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Currently where you create a new custom field with a default value, and then search for the default via the UIrelated search screen, or run a call via an API, the system will not pick up results that match the default value. In the v12.10 release, we have made a change to remedy this issue, to ensure that where default values are applied in a search screen or API call, the system will find these results. Please be aware that any reports will need to be re-factored to support where the default value is used as a criterion.
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